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Standards Development
This part of IEC 60255 defines the requirements of the protection data interface for the communication system used. These requirements are depending from the protection principle used (e.g. distance protection, line differential protection). The relevant communication systems are evaluated with the necessary measures to use for the protection data interface.
There is no official document (technical report, specification or standard) available defining the general requirements of a protection data interface for the communication. In practice, different communication technologies are used without relying on a general requirement. The operator/user of such protection systems needs to evaluate the application at the respective manufacturer. The only standard defining requirements for a protection data interface is IEEE C37.94, whereas this standard requires a Time Division Multiplexing technology which has already been discontinued and is only rarely available nowadays. Converter are available on the market to provide an IEEE C37.94 interface over a state of the art communication technology, whereas this should only be a temporary solution for a migration process but no permanent solution because this converter causes either an increased latency on the network which consequently increases the tripping time of the protection relay and/or it requires a multiple of the net data rate.
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